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CVE-2021-23394

CriticalPublished

Remote Code Execution (RCE)

Published: Jun 13, 2021
Updated: Sep 16, 2024
Assigning CNA: snyk
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

18.9%

Moderate · next 30 days

Percentile: 97.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The package studio-42/elfinder before 2.1.58 are vulnerable to Remote Code Execution (RCE) via execution of PHP code in a .phar file. NOTE: This only applies if the server parses .phar files as PHP.

Sources

CVE-2021-23394PoC
Docker container to setup a vulnerable elfinder version on both nginx and apache servers. Can be used to test vulnerability POC

Responsible use

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